A hobbyist reverse-engineered the PROM firmware of the SGI O2 workstation (1996) to enable CPU upgrades, specifically to support the 900 MHz RM7900 MIPS processor. Using the Capstone disassembler and deep knowledge of the MIPS boot process, the engineer disassembled a 512 kB PROM binary and produced source files that reassemble into bit-identical ROM images. This opens the door to modifying the PROM to support faster CPUs. The ip32prom-decompiler project is available on GitHub.
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